Lamb waves offer a promising method of evaluating damage in composite materials. The Lamb wave velocity is directly related to the material parameters, so an effective tool exists to monitor damage in composites by measuring the velocity of these waves. The Lamb Wave Imager™ (LWI) uses a pulse/receive technique that excites an antisymmetric Lamb mode and measures the time-of-flight over a wide frequency range. Given the material density and plate thickness, the bending and out-of-plane shear stiffnesses are calculated from a reconstruction of the dispersion curve. In this study, the time-of-flight as well as the elastic stiffnesses and for composite samples which have undergone combined thermal and mechanical aging are obtained. The samples examined include a baseline specimen with 0 cycles, specimens which have been aged 2350 and 3530 cycles at high strain levels, and one specimen aged 3530 cycles at low strain levels.
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September 1999
September 01 1999
Lamb wave characterization of the effects of long-term thermal-mechanical aging on composite stiffness
Michael D. Seale;
Michael D. Seale
NASA Langley Research Center, Mail Stop 231, Hampton, Virginia 23681
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Eric I. Madaras
Eric I. Madaras
NASA Langley Research Center, Mail Stop 231, Hampton, Virginia 23681
Search for other works by this author on:
Michael D. Seale
Eric I. Madaras
NASA Langley Research Center, Mail Stop 231, Hampton, Virginia 23681
J. Acoust. Soc. Am. 106, 1346–1352 (1999)
Article history
Received:
June 04 1998
Accepted:
June 01 1999
Citation
Michael D. Seale, Eric I. Madaras; Lamb wave characterization of the effects of long-term thermal-mechanical aging on composite stiffness. J. Acoust. Soc. Am. 1 September 1999; 106 (3): 1346–1352. https://doi.org/10.1121/1.427168
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